ENGINEERING GRAPHICS CLASS - XII (046) DESIGN OF THE QUESTION PAPER Time : 3 Hrs Max. Marks : 70 The weightage of the distribution of marks over different contents of the question paper shall be as follows: A. WEIGHTAGE TO CONTENTS / SUBJECT UNITS Unit Contents Marks I Isometric Projection of Solids 25 II Machine Drawing a) Machine Parts 15 b) Assembly / Disassembly 30 TOTAL 70 B. SCHEME OF OPTIONS 1. There will be no overall options. 2. Internal Choices has been given in question of Machine Drawing. C. WEIGHTAGE TO DIFFERENT LEVEL OF QUESTIONS S.No. Estimated Difficult Level Percentage 1 Easy 15 2 Average 70 3 Difficult 15 # A weightage of 20% has been assigned to questions which test higher order thinking skills. 1
ENGINEERING GRAPHICS CLASS - XII (046) BLUE PRINT Time : 3 Hrs Max. Marks : 70 1. UNIT I ISOMETRIC PROJECTION OF SOLIDS 24 S.No. Contents Weightage a) Construction of Isometric Scale 4 b) Isometric Projection of a single vertical solid 7 c) Isometric Projection of combination of two solids 13 2. UNIT II MACHINE DRAWING 41 a) MACHINE PARTS 13 S.No. Contents Weightage i) Drawing of machine parts by scale 1:1 using 8 instruments ii) Drawing of machine parts by sketching free 5 hand b) ASSEMBLY / DISASSEMBLY 28 S.No. Contents Weightage i) Orthographic Views 22 ii) Title, Symbol of Projection, Scale, Dimension, 6 Line Work 3. SIMPLE MULTIPLE CHOICE QUESTIONS 5 (Only five questions based on the fundamentals of the above units.) 2
SAMPLE QUESTION PAPER I ENGINEERING GRAPHICS (046) Time Allowed: 3 hours Maximum Marks: 70 Note: (i) Attempt all the questions. (ii) Use both sides of the drawing sheet, if necessary. (iii) All dimensions are in millimetres. (iv) Missing and mismatching dimensions, if any, may be suitably assumed. (v) Follow the SP: 46, 2003 revised codes. (with First angle method of projection) (vi) In no view of question 2, are hidden edges or lines required. (vii)in question 4, hidden edges or lines are to be shown in views without section. (viii) Number your answers according to questions. Q1. Answer the following multiple choice questions. Print the correct choice on your drawing sheet. 5 (i) In isometric projection the three edges of an object are inclined to each other at (a) 60 o (b) 120 o (c) 100 o (d) 90 o (ii) The angle between the flanks of a metric thread is (a) 60 o (b) 90 o (c) 75 o (d) 55 o (iii) The number of cotters used in an assembly of sleeve and cotter joint are (a) One (b) Five (c) Four (d) Two (iv) A square lamina in isometric projection appears as (a) Rhombus (b) Rectangle(c) Trapezium (d) Parallelogram (v) Hidden / invisible edges are represented as (a) (b) (c) (d) Q.2 (a) Construct an isometric scale of length 80mm. 4 (b) Draw the isometric projection to isometric scale of an inverted cone (diameter=70mm, height=75mm) with the circular face on top and its axis perpendicular to the H.P. Give all the dimensions. 7 (c) A hexagonal pyramid of base edges 25mm and height 50mm, is placed centrally on its on the top face of a square prism of base side 80mm and height 20mm. Two hexagonal base opposite edges of the hexagonal base of the pyramid are perpendicular to the V.P. The common axes are perpendicular to the H.P. Draw the isometric projection of the combination to isometric scale. Give all the dimensions and indicate the direction of viewing. 13 3
Q.3 (a) Draw to scale 1:1, the standard profile of the metric thread (internal) with the pitch=50mm.give standard dimensions. 8 OR Draw to scale 1:1, the front view and side view of a tee headed bolt with diameter M25, keeping its axis parallel to both V.P and H.P. Give standard dimensions. (b) Sketch free hand the front view and top view of a cheese head screw of size M20, keeping its axis vertical. Give all the standard dimensions. 5 OR Sketch free hand the front view, top view and side view of a rectangular sunk taper key for a shaft of 60mm diameter. Give all the standard dimensions. Q.4 Assemble the given V-Belt Pulley, Shaft and Rectangular Sunk Key as shown in Fig 1 and draw the following views, to scale 1:1: 28 (a) Front View, upper half in section. 13 (b) Side view looking from the right end. 09 (c) Give 8 important dimensions, Title, Projection symbol and Scale. 06 4
OR Dis-assemble the Bushed Bearing as shown in Fig 2, and draw the views of the following parts: (a) BODY (i) Front View, left half in section. 15 (ii) Top View. (b) BUSH (i) Front View, right half in section. 7 (ii) Top View. (c) Give 8 important dimensions, Title, Projection symbol and Scale. 6 5
SAMPLE QUESTION PAPER I VALUE POINTS Q1 MULTIPLE CHOICE QUESTIONS (i) b 1 (ii) a 1 (iii) d 1 (iv) a 1 (v) d 1 Q2 (a) ISOMETRIC SCALE : FIG 1.1 4 (i) Drawing 45 o inclined lines showing true lengths 1 (ii) Projections on 30 o inclined line showing isometric length with one 1mm subdivisions 2 (iii) Writing titles, sub titles and angles 1 (b) ISOMETRIC PROJECTION OF A CONE : FIG 1.2 7 (i) Drawing elliptical curve 3 (ii) Drawing two generators 2 (iii) Indicating the axis 1 (iv) Three dimensions 1 (c) ISOMETRIC PROJECTION OF COMBINATION OF SOLIDS : FIG 1.3 13 (i) Helping figures 1 (ii) Drawing isometric squares 2 6
(iii) Drawing vertical lines indicating the faces 2 (iv) Drawing hexagonal base of pyramid 2 (v) Drawing slant edges 2 (vi) Common axis, dimensioning, direction of viewing 4 Q3 (a) METRIC THREAD (INTERNAL) : FIG 1.4 8 (i) Distance equal to pitch, and angles of 60 o 2 (ii) Flat edges and curves for threads 2 (iii) Side edges / flanks 2 (iv) Dimensions 2 7
TEE BOLT : FIG 1.5 8 Front View (i) Cylindrical shank, square neck and centre line 2½ (ii) Head of bolt 1 Side View (i) Two circles (ii) Square neck and rest of the portion 8 1½ 1½
Dimensions 1 ½ (b) CHEESE HEAD SCREW : FIG 1.6 5 (i) Sketching head with threaded shank 2½ (ii) Sketching conventional top view 1 (iii) Writing title, standard values and axis 1½ OR RECTANGULAR SUNK TAPER KEY : FIG 1.7 5 (i) Sketching front view 1½ (ii) Sketching top view and side view 2 (iii)writing title and standard values 1½ Q 4 ASSEMBLY OF V-BELT PULLEY: FIG 1.8 28 (a) FRONT VIEW, UPPER HALF IN SECTION Drawing upper half in section with V groove. 8 Drawing Lower half without section. 5 (b) SIDE VIEW, VIEWING FROM THE RIGHT HAND SIDE Drawing five circles. 5 Drawing other details. 4 9
(c) OTHERS Important Dimensions. 2 Titles, Symbol of Projection and Scale. 4 OR DIS-ASSEMBLY OF BUSHED BEARING: FIG 1.9 28 (a) BODY (i) Front View. Drawing left half in section. 5 Drawing right half without section. 3 (ii) Top View. 7 (b) BUSH (i) Front View, right half in section. 4 (ii) Top View. 3 (c) OTHERS Important Dimensions. 2 Titles, Symbol of Projection and Scale. 4 10
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